Insulator.



B. S. PURKEY.

INSULATOR. APPLICATION FILED A1AY4.r914.

Patented D00 ff/fffhip BENJAMIN S. PURKEY, 0F TACOMA, WASHINGTON.

INSULATOR.

Specication of Letters Patent.

Patented Dec. 25, 1917.

Application led May 4,1914. Serial No. 836,235.

To all 'whom t may concern:

Be it known that I, BENJAMIN S. PURKEY, a citizen of the United States, residing at Tacoma, in the county of Pierce and State of Washington, have invented certain new and useful Improvements in Insulators; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. A

This invention 'relates to insulators and has for its object to provide an insulator with improved means for retaining an insulated wire in position relative to such insulator.

A further object of the invention is to provide improved means for retaining the wire in position in the insulator without the use of latches), ties or other fastening means.

With these and other objects in view the invention comprises certain novel constructions, combinations and arrangement of parts as will be hereinafter more fully de-` scribed and claimed.

In the drawings: I Figure 1 is a view of the insulator in side elevation.

Fig. 2 is a view of the insulator in sec-y tion taken on line 2--2 of Fig. l.

Fig. 3 .is a sectional view taken on line 3-3 of Figs, 1 and 2.

Fig. 4 is a top plan View of the insulator. Like characters of reference designate corresponding parts throughout the several views.

The improved insulator which forms .the

subject matter of this application is pro-A vided with a body 10 of any approved for- .mation with any usual-or ordinarylmeans for attaching to any usual or ordinary support not here shown andiorming no part of the present invention. As shown at Figs. 1 and 2 a head 11 is provided although it is' to be understood that the external configuration, shape or form of the insulator is also wholly non-essential tothe present invention.

Extending diametrically across the top of the insulator is a slit 12 extending as a lane a short distance downwardly into the insulator structure and then rotating spirally on the axis of the insulator, such spiral rotation being indicated at 13 in Figs. 1 and 2, The rotation of the slit-forming line upon the axis of the insulator is such that when the wire is inserted, in the slit and turned to follow the formation of the slit it stands at an angleto the slit as indicated at 'FLigs 3 and 4, the wire being indicated at- The present insulator is intended for use in connection with an insulated wire and means is provided for holding the wire lagainst longitudinal lmovement relative to the insulator byemploying means for gripping the insulation. The means employed are' ribs 15 and 16 which are formed respectively in the lower and upper walls of the spiral slot as indicated at Figs. 1, 2 and 3 and preferably coinciding with lines concentric to the axis of the insulator so that as the insulated wire is forced downwardly and turned to follow the spiral slot the ribs l5 and 16 are pressed' into the material of the insulation, thereby gripping the insulation at four kpoints as indicated at Fig. 2 and preventing longitudinal movement of the wire. The wedging or gripping action of the ribs 15 and 16 upon the insulating material of the wire also serves to prevent It will be seen from the abovethat after l I the wire 14 has been inserted in the groove of the insulator and securely gripped Abetween the opposed convergently spaced gripping ridges 15 and 16 that thefwire cannot be drawn `diametrically across the insulator, whether the wire is taut or is slack, unless there is' a relative angular.

ends of the gripjme 1. An insulator` having a diametrical andi I spiral wire receiving slot forming a seat at its inner end in which the wire lies im a straight or undeiiected position diametrically across the insulator, and opposed, convergently spaced, gripping ridges, concen-v tric withvthe axis of the insulator, on the upper and lower groove surfaces adapted to transversely bite into the insulation on an inserted wire to prevent axial movement thereof whether it is 'tight or slack,

2. An insulator having a diametrieal and on an inserted Wire to prevent axial Inove- 10 spiral Wire receiving slot forming; ,a seat ment thereof Whether it is tight or slack. at its inner end in Which the Wire lies in a In testimony whereof I affix my signature straight or undeeced position dianetriin presence of tWo witnesses. 5 cally across the insu ator, an pairs o opposed, convergently spaced, gripping ridges v BENJAMIN S' PURKEY' Aconcentric with the axis of the insulator on Witnesses:

the upper and lower groove surfaces adapt- H. B. LA MONTE, ed to transversely bite into the insulation WINIFRED PARKER. 

